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Note 10 - Segment Data (Details) - Financial Information from Reportable Segments (USD $)
 3 Months Ended 9 Months Ended
Sep. 29, 2013
Sep. 30, 2012
Sep. 29, 2013
Sep. 30, 2012
Net revenue from unaffiliated customers:        
Net revenue $ 76,278,000 $ 78,763,000 $ 236,855,000 $ 274,138,000
Gross profit (loss):        
Gross profit 7,261,000 9,374,000 23,673,000 35,111,000
Operating income (loss):        
Operating income (loss) (975,000) 635,000 (8,545,000) 9,606,000
Industrial Group [Member]
        
Net revenue from unaffiliated customers:        
Net revenue 66,650,000 65,176,000 212,231,000 230,548,000
Gross profit (loss):        
Gross profit 7,417,000 6,574,000 24,385,000 25,402,000
Operating income (loss):        
Operating income (loss) 4,628,000 3,801,000 15,989,000 17,254,000
Electronics Group [Member]
        
Net revenue from unaffiliated customers:        
Net revenue 9,628,000 13,587,000 24,624,000 43,590,000
Gross profit (loss):        
Gross profit (156,000) 2,800,000 (712,000) 9,709,000
Operating income (loss):        
Operating income (loss) (3,521,000) (947,000) (18,116,000) (487,000)
General, Corporate and Other [Member]
        
Operating income (loss):        
Operating income (loss) $ (2,082,000) $ (2,219,000) $ (6,418,000) $ (7,161,000)